Potato irrigation method based on leaf water potential optimization and automatic drip irrigation device

Abstract

The invention discloses a method for optimizing potato irrigation based on leaf water potential and an automatic drip irrigation device. Relates to the technical field of agricultural irrigation. Comprising the following steps: step 1, determining different growth periods of potatoes; step 2, setting a test; step 3, measuring the leaf water potential of the potatoes in the different growth periods; step 4, determining the change range of the leaf water potential of the potatoes in the different growth periods; step 7, determining the irrigation frequency of the potatoes in each growth period. By means of the potato irrigation method based on leaf water potential optimization and the automatic drip irrigation device, precise irrigation of potatoes is achieved, the water requirements of the potatoes in different growth periods are met, the water resource utilization efficiency is improved, the yield and quality of the potatoes are improved, and meanwhile the labor cost and the labor intensity are reduced.

Description

Technical Field

[0001] The invention relates to the technical field, and more particularly to a potato irrigation method based on leaf water potential optimization and an automatic drip irrigation device. Background Art

[0002] As one of the main potato producing areas in my country, Inner Mongolia plays an important role in potato cultivation. Its unique geographical environment and climatic conditions provide certain advantages for potato growth. Inner Mongolia has a wide range of potato planting areas. According to data in 2024, the potato planting area in Inner Mongolia Autonomous Region is about 4 million mu, of which 677,000 mu is planted in Hohhot. The planting areas are mainly concentrated in Ulanqab, Hohhot, Chifeng and other regions. The soil types in these areas are diverse, mainly chestnut-calcium soil and black calcium soil. There are certain differences in soil fertility, but overall they have the basic conditions for growing potatoes. The potato varieties planted are rich, including Kexin No. 1, Zihuabai and other varieties suitable for the local environment. These varieties have their own characteristics in terms of yield and quality.

[0003] However, the water resources in Inner Mongolia face many challenges. In terms of total water resources, Inner Mongolia is a region with relatively scarce water resources, with uneven annual precipitation and relatively low overall precipitation. Annual precipitation in most areas is between 200 and 400 mm, with precipitation mainly concentrated in summer, accounting for about 60% to 80% of annual precipitation, while precipitation is scarce in other seasons. This temporal and spatial distribution of precipitation may lead to insufficient precipitation during critical periods of potato growth, such as the tuber swelling period, making it difficult to meet the large demand for water for the vigorous growth of potatoes. At the same time, the evaporation in Inner Mongolia is large, especially in spring and summer, when the dry and windy climate causes rapid evaporation of water, further exacerbating the tense situation of water resources.

[0004] In the process of potato planting, irrigation is the key link to ensure its high and stable yield. However, there are still many problems in potato irrigation in Inner Mongolia. Traditional irrigation methods, such as flooding, are still common in some local areas. This irrigation method lacks precision and cannot be reasonably irrigated according to the water demand characteristics of potatoes in different growth periods. During the germination period, excessive irrigation may cause hypoxia and rot of seed potatoes, affecting the emergence rate; and during the tuber expansion period, insufficient irrigation will seriously affect the expansion of tubers and reduce yield. In addition, flooding will also cause a lot of water resources to be wasted. Since the irrigation water cannot be fully absorbed and utilized by potatoes, most of the water will be lost through deep infiltration and surface runoff. According to statistics, under traditional irrigation methods, the effective utilization rate of water resources is only 30% to 40%. The long-term use of this extensive irrigation method will not only cause a great waste of water resources, but also may cause a series of ecological and environmental problems, such as secondary salinization of soil. In some areas with unreasonable irrigation, due to the rising groundwater level, salt accumulates on the soil surface with the evaporation of water, resulting in a decrease in soil fertility and affecting the growth of potatoes and other crops.

[0005] Leaf water potential is an important physiological indicator reflecting the water status of plants and is closely related to the growth, development and yield of plants. By monitoring leaf water potential to regulate irrigation, the water needs of crops can be met more accurately. However, there is currently little research on optimized irrigation technology based on leaf water potential for potatoes in Inner Mongolia, and there is a lack of systematic and operational technical methods. Existing irrigation technology is difficult to adapt to the complex water resources and potato planting needs in Inner Mongolia.

[0006] Potato is a common high-starch crop, and it is a crop that requires a lot of water. During the potato planting process, appropriate amount of water is irrigated according to different growth cycles. For example, during the potato seedling period, the field water holding capacity is about 60%; during the potato plant growth period, the maximum field water holding capacity is 70% to 80%.

[0007] The growth process of potatoes is easily affected by different factors in the planting environment, such as the four major environmental factors: light intensity, airflow, temperature, and soil moisture content.

[0008] However, the existing automated drip irrigation devices for potato planting cannot more accurately meet the crop's water needs based on the actual conditions of the potatoes.

[0009] Therefore, how to provide a scientific and reasonable irrigation technology to achieve efficient water-saving irrigation of potatoes, improve water resource utilization efficiency, and ensure potato yield and quality based on leaf water potential optimization potato irrigation method and automatic drip irrigation device is a problem that technical personnel in this field urgently need to solve. Summary of the invention

[0010] In view of this, the present invention provides a potato irrigation method and an automatic drip irrigation device based on leaf water potential optimization, aiming to solve one of the problems in the above-mentioned background technology, realize scientific and reasonable irrigation technology, realize efficient water-saving irrigation of potatoes, improve water resource utilization efficiency, and ensure potato yield and quality.

[0011] In order to achieve the above object, the present invention provides a method for optimizing potato irrigation based on leaf water potential, comprising the following steps: Step 1: Determine the different growth stages of potatoes: The growth period includes the seedling stage, tuber formation stage, tuber expansion stage and starch accumulation stage; Step 2: Set up the experiment: A potato field moisture experiment was set up at different irrigation levels, covering a variety of moisture treatment scenarios from drought stress to over-irrigation, with multiple replicate test fields set up for each treatment; Step 3: Determine the water potential of potato leaves at different growth stages: Starting from the seedling stage, during the same period of each growth period, the leaf water potential of potato leaves was measured with the fourth fully expanded leaf as the research object, and data were collected multiple times daily. Step 4: Determine the range of potato leaf water potential at different growth stages; Step 5: Explore the relationship between leaf water potential and yield under different water treatments and determine the threshold value; Step 6: Determine the amount of irrigation water for different growth stages; Step 7: Determine the number of irrigation times for potatoes at each growth stage.

[0012] Furthermore, in step 2, the results of the experimental determination are as follows: The leaf water potential of potato seedlings needs to be maintained at [-0.80MPa to -0.60MPa]; During the potato tuber formation period, the leaf water potential needs to be maintained at [-1.20MPa to -1.00MPa]; During the potato tuber expansion period, the leaf water potential needs to be maintained at [-1.50MPa to -1.30MPa]; During the starch accumulation period of potato, the leaf water potential needs to be maintained at [-1.31MPa to -1.10MPa].

[0013] Furthermore, in step six, the irrigation amount is determined according to different growth stages so that the soil moisture content reaches a corresponding proportion of the field water holding capacity, wherein irrigation is performed to 50%-60% of the field water holding capacity during the seedling stage, 65%-75% of the field water holding capacity during the tuber formation stage, 75%-85% of the field water holding capacity during the tuber swelling stage, and 50%-60% of the field water holding capacity during the starch accumulation stage.

[0014] Furthermore, in step seven, the irrigation times are dynamically calculated based on the leaf water potential thresholds at different growth stages, soil water holding capacity characteristics, and climatic conditions, such as evaporation and rainfall.

[0015] On the other hand, the present invention provides a potato automatic drip irrigation device, which is suitable for potato irrigation in the above-mentioned potato irrigation method based on leaf water potential optimization, comprising: A water pump, wherein the output end of the water pump is provided with a water supply pipeline, and the water supply pipeline is provided with a throttle valve; A water supply branch pipe, wherein N water supply branch pipes are provided, N ≥ 2, one end of each of the N water supply branch pipes is connected to the water supply pipeline, each of the water supply branch pipes is provided with a plurality of water injection pipes, the plurality of water injection pipes are arranged at equal intervals along the direction of the water supply pipeline, and two water injection pipes on the water supply branch pipe are symmetrically arranged along the direction of the water supply pipeline, each of the water injection pipes is connected to the water supply branch pipe through a connecting hose, and the water injection pipes are inserted into the ground in a vertical direction; A main concealed pipe is arranged below the water supply branch pipe, and N main concealed pipes are arranged corresponding to the water supply branch pipes, where N≥2, and a transverse concealed pipe is arranged between two adjacent main concealed pipes. A plurality of transverse concealed pipes are arranged at equal intervals along the direction of the main concealed pipes.

[0016] Furthermore, it also includes a drip irrigation filter, which is arranged on the water supply pipe and located between the throttle valve and the water pump. A check valve is provided between the drip irrigation filter and the water pump. A base is provided at the bottom of the drip irrigation filter, and a controller is provided on the base.

[0017] Furthermore, it also includes a dew point water potential meter, which is arranged on a side of the base away from the controller.

[0018] Furthermore, a connecting pipe buckle is provided at one end of the connecting hose away from the water supply branch pipe, and a thread is provided on the top of the water injection pipe for detachable connection with the connecting pipe buckle.

[0019] Furthermore, it also includes a flushing pipe, one end of which is connected to the water supply pipe, and the other end of which is connected to the main concealed pipe.

[0020] It can be seen from the above technical solutions that, compared with the prior art, the present invention discloses a potato irrigation method and an automatic drip irrigation device based on leaf water potential optimization. By setting potato field moisture tests at different irrigation levels, multiple repeated test fields are set for each treatment to ensure the reliability and scientificity of the data; by collecting data multiple times on a daily basis, the error fluctuation caused by environmental factors is reduced; by accurately determining the leaf water potential threshold of each stage based on the yield peak value of each growth period of potatoes and the corresponding leaf water potential stable range, irrigation is carried out when the leaf water potential is lower than the lower limit of the corresponding period, thereby achieving precise irrigation of potatoes, meeting the water demand of potatoes in different growth periods, improving the efficiency of water resource utilization, increasing potato yield and quality, and reducing labor costs and labor intensity. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0022] Figure 1-3 A schematic diagram of the relationship between leaf water potential and yield of potato in the seedling stage provided by the present invention; Figure 4-6 A schematic diagram of the relationship between potato leaf water potential and yield during the tuber formation period provided by the present invention; Figure 7-9 A schematic diagram of the relationship between potato leaf water potential and yield during the tuber expansion period provided by the present invention; Figure 10-12 A schematic diagram of the relationship between potato leaf water potential and yield during the starch accumulation period provided by the present invention; Figure 13-15 A schematic diagram comparing the potato irrigation dosage provided by the present invention; Figure 16-18 A schematic diagram for comparing potato yields provided by the present invention; Fig.19 A schematic diagram of the structure of the potato automatic drip irrigation device provided by the present invention; Fig. 20 A rear view of the potato automatic drip irrigation device provided by the present invention; Fig.21 A schematic diagram of the structure of the water injection pipe and the connecting hose provided by the present invention; Fig. 22 This is a top view of the potato automatic drip irrigation device provided by the present invention.

[0023] Among them: 1 is a water pump; 2 is a water supply pipe; 3 is a throttle valve; 4 is a water supply branch pipe; 5 is a water injection pipe; 6 is a connecting hose; 7 is a main concealed pipe; 8 is a horizontal concealed pipe; 9 is a drip irrigation filter; 10 is a check valve; 11 is a base; 12 is a controller; 13 is a dew point water potential meter; 14 is a connecting pipe buckle; 15 is a flushing pipe; 16 is a pressure gauge. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] See also Figure 1-22 The embodiment of the present invention discloses a potato irrigation method based on leaf water potential optimization, comprising: Step 1: Determine the different growth stages of potatoes: The growth period includes the seedling stage, tuber formation stage, tuber expansion stage and starch accumulation stage; Step 2: Set up the experiment: Set up potato field moisture tests at different irrigation levels, covering a variety of moisture treatment scenarios from drought stress to over-irrigation, with multiple replicate test fields for each treatment to ensure the reliability and scientificity of the data; Step 3: Determine the water potential of potato leaves at different growth stages: Starting from the seedling stage, during the same period of each growth period, the fourth fully expanded potato leaf was used as the research object to measure the leaf water potential of potato leaves. Data were collected multiple times every day to reduce the error fluctuation caused by environmental factors. Step 4: Determine the range of potato leaf water potential at different growth stages; Step 5: Explore the relationship between leaf water potential and yield under different water treatments and determine the threshold value; in the experimental fields with different water treatments, record the changes in leaf water potential of different potato varieties at different growth stages and the corresponding potato yields in detail; data analysis shows that as the soil moisture content gradually transitions from drought to a suitable range, the leaf water potential shows an upward trend, and the yield also increases steadily; when the soil moisture content exceeds the suitable range and approaches over-irrigation, the leaf water potential further increases in the short term, but then due to problems such as root hypoxia, the plant growth is hindered, the leaf water potential drops rapidly, and the yield also decreases significantly; The yield peaks of the three potato varieties at each growth period and the corresponding leaf water potential stability intervals were combined to accurately determine the leaf water potential thresholds at each stage; for example, the lower threshold at the seedling stage was -0.80MPa, and the upper threshold was -0.60MPa. The yield growth in this range was stable and efficient, as shown in the attached figure. Figure 1-3 The lower threshold of tuber formation period is -1.20MPa, and the upper threshold is -1.00MPa. Within this threshold range, the quantity and quality of tuber formation are both good. Figure 4-6 The lower limit of the tuber expansion period is -1.50MPa, and the upper limit is -1.30MPa, which can ensure the fastest tuber expansion rate and good quality. Figure 7-9 The lower threshold of starch accumulation period is -1.31MPa, and the upper threshold is -1.10MPa, which ensures efficient starch accumulation and lays the foundation for high-quality potatoes. Figure 10-12 ; Irrigate when the leaf water potential is lower than the lower limit of the corresponding period; Step 6: Determine the amount of irrigation water for different growth stages; Step 7: Determine the number of irrigation times for potatoes at each growth stage.

[0026] In this embodiment, in step 2, the results of experimental determination are as follows: The leaf water potential of potato seedlings needs to be maintained at [-0.80MPa to -0.60MPa]; at this time, the root system of the plant can develop better, laying the foundation for later growth; During the potato tuber formation period, the leaf water potential needs to be maintained at [-1.20MPa to -1.00MPa]; this is conducive to the differentiation and formation of tubers; During the potato tuber expansion period, the leaf water potential needs to be maintained at [-1.50MPa to -1.30MPa]; this can effectively promote the increase of tuber volume and weight; During the potato starch accumulation period, the leaf water potential needs to be maintained at [-1.31MPa to -1.10MPa]; this is conducive to the efficient accumulation of starch and ensures the quality and yield of potatoes.

[0027] In this embodiment, in step six, the irrigation amount is determined according to different growth stages so that the soil moisture content reaches a corresponding proportion of the field water holding capacity, wherein the seedling stage is irrigated to 50%-60% of the field water holding capacity, the tuber formation stage is irrigated to 65%-75% of the field water holding capacity, the tuber expansion stage is irrigated to 75%-85% of the field water holding capacity, and the starch accumulation stage is irrigated to 50%-60% of the field water holding capacity; controlling the irrigation amount within the range of the soil reaching the field water holding capacity can not only ensure that the soil contains sufficient water for potato growth, but also maintain good air permeability, which is beneficial to root respiration and nutrient absorption.

[0028] In this embodiment, in step seven, the number of irrigations is dynamically calculated based on the leaf water potential thresholds, soil water holding capacity characteristics and climatic conditions, such as evaporation and rainfall, at different growth stages; taking the seedling stage as an example, under dry, rainless and high temperature climatic conditions, if the frequency of the leaf water potential dropping to the lower threshold increases, irrigation may be required every day or every other day; in moist and cool periods, the irrigation interval can be appropriately extended to 3-5 days; during the tuber formation and swelling period, due to the strong demand for water by the plant, combined with the real-time monitoring of leaf water potential, when water consumption is fast, the number of irrigations may reach once every 2-3 days; during the starch accumulation period, as the growth rate slows down, the number of irrigations is adjusted to once every 4-6 days based on the actual leaf water potential changes; through this dynamic and flexible regulation of the number of irrigations, it is ensured that potatoes can obtain accurate and appropriate water supply at each growth node.

[0029] On the other hand, the present invention provides a potato automatic drip irrigation device, which is suitable for potato irrigation in the above-mentioned potato irrigation method based on leaf water potential optimization, comprising: A water pump 1, wherein the output end of the water pump 1 is provided with a water supply pipe 2, and a throttle valve 3 is provided on the water supply pipe 2; A water supply branch pipe 4, wherein N water supply branch pipes 4 are provided, N ≥ 2, one end of each of the N water supply branch pipes 4 is connected to the water supply pipeline 2, and each water supply branch pipe 4 is provided with a plurality of water injection pipes 5, which are arranged at equal intervals along the direction of the water supply pipeline 2, and two water injection pipes 5 on the water supply branch pipe 4 are symmetrically arranged along the direction of the water supply pipeline 2, and each water injection pipe 5 is connected to the water supply branch pipe 4 through a connecting hose 6, and the water injection pipe 5 is inserted into the ground in a vertical direction; the water injection pipe 5 is inserted into the soil to irrigate the roots of potato crops, thereby improving the water utilization efficiency of potato irrigation; A main concealed pipe 7 is arranged below the water supply branch pipe 4. N main concealed pipes 7 are arranged corresponding to the water supply branch pipes 4, where N≥2. A transverse concealed pipe 8 is arranged between two adjacent main concealed pipes 7. Multiple transverse concealed pipes 8 are arranged at equal intervals along the direction of the main concealed pipe 7. The main concealed pipe 7 and the transverse concealed pipe 8 are buried 80-120 cm below the drip irrigation water injection pipe 5. The main concealed pipe 7 and the transverse concealed pipe 8 use water-permeable corrugated pipes. An EC sensor is arranged at the drainage outlet of the main concealed pipe 7 to monitor the EC value of the soil. By arranging the main concealed pipe 7 and the transverse concealed pipe 8, excess moisture in the soil can be infiltrated into the pipe from the water filtration micropores on the pipe wall of the main concealed pipe 7 and the transverse concealed pipe 8 and discharged, thereby controlling the groundwater level, regulating soil moisture, and improving the physical and chemical properties of the soil.

[0030] In this embodiment, a drip irrigation filter 9 is further included. The drip irrigation filter 9 is arranged on the water supply pipe 2, and the drip irrigation filter 9 is located between the throttle valve 3 and the water pump 1. A check valve 10 is provided between the drip irrigation filter 9 and the water pump 1. A base 11 is provided at the bottom of the drip irrigation filter 9, and a controller 12 is provided on the base 11. The drip irrigation filter 9 is used to eliminate impurities in the medium to protect the normal use of the throttle valve 3 and the water supply pipe 2.

[0031] In this embodiment, a dew point water potential meter 13 is also included. The dew point water potential meter 13 is arranged on a side of the base 11 away from the controller 12. The dew point water potential meter 13 is a device for measuring the water potential of soil or leaves, and its sensor can be selected from different types of sensors as needed.

[0032] In this embodiment, a connecting pipe buckle 14 is provided at one end of the connecting hose 6 away from the water supply branch pipe 4, and a thread is provided on the top of the water injection pipe 5 to be detachably connected to the connecting pipe buckle 14, so as to facilitate later installation and replacement.

[0033] In this embodiment, a flushing pipe 15 is also included. One end of the flushing pipe 15 is connected to the water supply pipe 2, and the other end of the flushing pipe 15 is connected to the main concealed pipe 7. The main concealed pipe 7 and the lateral concealed pipe 8 are flushed through the flushing pipe 15 to accelerate salt migration and reduce salt accumulation at the edge of the wet area. In this embodiment, a pressure gauge 16 is also included. The pressure gauge 16 is arranged on the water supply branch pipe 4. The pressure of the water supply branch pipe 4 is monitored by the pressure gauge 16 to ensure that the water pressure is guaranteed to be normal for irrigation.

[0034] Irrigation dosage comparison example Demonstration site: Shangtuhai Township, Wuchuan County, Hohhot City, Inner Mongolia Autonomous Region. The soil type is mainly chestnut soil, with significant temperate continental monsoon climate characteristics, characterized by long and cold winters, short and relatively cool summers, and large temperature differences between day and night. The average temperature for many years is between 2-4℃, the average frost-free period is 110-115 days per year, the average annual sunshine hours are 2952 hours, and the average annual precipitation is 300-350mm, with precipitation mainly concentrated in June-August in summer; Demonstration varieties: Wotu No. 5, Beishu No. 3, Xuechuanhong Target yield: 3 tons / acre By the attached Figure 13-15 The results show that the irrigation amount recommended by this technology is 30%-40% lower than the traditional irrigation amount of farmers, based on a comprehensive analysis of the irrigation amount of the three potato varieties during the entire growth period. This not only reduces the environmental risks caused by water resource loss, but also improves the utilization efficiency of irrigation water.

[0035] Potato Yield Comparative Example The potato yields of the irrigation method optimized by this technology and the conventional irrigation method of farmers were statistically analyzed. The results are shown in the attached Figure 16-18 : From the attached Figure 16-18 It can be seen from the statistical results of multi-point yield measurement data that, based on the yield data of three potato varieties, compared with farmers' conventional irrigation, this technology can increase potato yields by 10%-15%, achieving the sustainable development goals of water saving, increased yields, and green efficiency improvement.

[0036] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0037] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for optimizing potato irrigation based on leaf water potential, characterized in that: include: Step 1: Determine the different growth stages of potatoes: The growth period includes the seedling stage, tuber formation stage, tuber expansion stage and starch accumulation stage; Step 2: Set up the experiment: A potato field moisture experiment was set up at different irrigation levels, covering a variety of moisture treatment scenarios from drought stress to over-irrigation, with multiple replicate test fields set up for each treatment; Step 3: Determine the water potential of potato leaves at different growth stages: Starting from the seedling stage, during the same period of each growth period, the leaf water potential of potato leaves was measured with the fourth fully expanded leaf as the research object, and data were collected multiple times daily. Step 4: Determine the range of potato leaf water potential at different growth stages; Step 5: Explore the relationship between leaf water potential and yield under different water treatments and determine the threshold value; Step 6: Determine the amount of irrigation water for different growth stages; Step 7: Determine the irrigation frequency at each growth stage of potatoes; In step 2, the results of the experiment are as follows: The leaf water potential of potato seedlings needs to be maintained at [-0.80MPa to -0.60MPa]; During the potato tuber formation period, the leaf water potential needs to be maintained at [-1.20MPa to -1.00MPa]; During the potato tuber expansion period, the leaf water potential needs to be maintained at [-1.50MPa to -1.30MPa]; During the starch accumulation period of potato, the leaf water potential needs to be maintained at [-1.31MPa to -1.10MPa].

2. A potato irrigation method based on leaf water potential optimization according to claim 1, characterized in that: In step six, the irrigation amount is determined according to different growth stages so that the soil moisture content reaches the corresponding proportion of the field water holding capacity, including irrigating to 50%-60% of the field water holding capacity during the seedling stage, 65%-75% of the field water holding capacity during the tuber formation stage, 75%-85% of the field water holding capacity during the tuber swelling stage, and 50%-60% of the field water holding capacity during the starch accumulation stage.

3. The method for optimizing potato irrigation based on leaf water potential according to claim 1, characterized in that: In step seven, the irrigation frequency is dynamically calculated based on the leaf water potential threshold at different growth stages, soil water holding capacity characteristics, and climatic conditions, such as evaporation and rainfall.

4. A potato automatic drip irrigation device, applied to the potato irrigation method based on leaf water potential optimization as claimed in any one of claims 1 to 3, characterized in that: include: A water pump, wherein the output end of the water pump is provided with a water supply pipeline, and the water supply pipeline is provided with a throttle valve; A water supply branch pipe, wherein N water supply branch pipes are provided, N ≥ 2, one end of each of the N water supply branch pipes is connected to the water supply pipeline, each of the water supply branch pipes is provided with a plurality of water injection pipes, the plurality of water injection pipes are arranged at equal intervals along the direction of the water supply pipeline, and two water injection pipes on the water supply branch pipe are symmetrically arranged along the direction of the water supply pipeline, each of the water injection pipes is connected to the water supply branch pipe through a connecting hose, and the water injection pipes are inserted into the ground in a vertical direction; A main concealed pipe is arranged below the water supply branch pipe, and N main concealed pipes are arranged corresponding to the water supply branch pipes, where N≥2, and a transverse concealed pipe is arranged between two adjacent main concealed pipes. A plurality of transverse concealed pipes are arranged at equal intervals along the direction of the main concealed pipes.

5. The potato automatic drip irrigation device according to claim 4, characterized in that: It also includes a drip irrigation filter, which is arranged on the water supply pipe and located between the throttle valve and the water pump. A check valve is provided between the drip irrigation filter and the water pump. A base is provided at the bottom of the drip irrigation filter, and a controller is provided on the base.

6. The potato automatic drip irrigation device according to claim 5, characterized in that: It also includes a dew point water potential meter, which is arranged on a side of the base away from the controller.

7. The potato automatic drip irrigation device according to claim 4, characterized in that: A connecting pipe buckle is provided at one end of the connecting hose away from the water supply branch pipe, and a thread is provided on the top of the water injection pipe for detachable connection with the connecting pipe buckle.

8. The potato automatic drip irrigation device according to claim 4, characterized in that: It also includes a flushing pipe, one end of which is connected to the water supply pipe, and the other end of which is connected to the main concealed pipe.

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